Add mouse implementation of most components.

src/ftxui/component/menu.cpp

@@ -8,18 +8,23 @@ namespace ftxui {
 Element Menu::Render() {
   std::vector<Element> elements;
   bool is_focused = Focused();
+  boxes_.resize(entries.size());
   for (size_t i = 0; i < entries.size(); ++i) {
     auto style = (selected != int(i))
                      ? normal_style
                      : is_focused ? focused_style : selected_style;
     auto focused = (selected != int(i)) ? nothing : is_focused ? focus : select;
     auto icon = (selected != int(i)) ? L"  " : L"> ";
-    elements.push_back(text(icon + entries[i]) | style | focused);
+    elements.push_back(text(icon + entries[i]) | style | focused |
+                       reflect(boxes_[i]));
   }
   return vbox(std::move(elements));
 }
 
 bool Menu::OnEvent(Event event) {
+  if (event.is_mouse())
+    return OnMouseEvent(event);
+
   if (!Focused())
     return false;
 
@@ -48,6 +53,23 @@ bool Menu::OnEvent(Event event) {
   return false;
 }
 
+bool Menu::OnMouseEvent(Event event) {
+  for (int i = 0; i < boxes_.size(); ++i) {
+    if (!boxes_[i].Contain(event.mouse_x(), event.mouse_y()))
+      continue;
+
+    if (event.is_mouse_left_down()) {
+      if (selected != i) {
+        selected = i;
+        TakeFocus();
+        on_change();
+      }
+      return true;
+    }
+  }
+  return false;
+}
+
 }  // namespace ftxui
 
 // Copyright 2020 Arthur Sonzogni. All rights reserved.